Spark-plug.



- iinrriin sri/irse JOHN W. IBAIRD, CHGAGG, ILLINOIS.

` SPARK-PLUG'.

i .acogen vSpecification of Letters Patent.

Patented Dee. 5, ieie.

Application filed October 23, 19H. Serial N o. 57,460.

To all lwhom it may concern i lie it known that I, JOHN W. Bami), a citizen oi' the United States, and a resident of the city of Chicago, county of Cook, and

State of Illinois, have invented certain newspark plug as mentioned, which. will be .of

simple construction and cflieient in use. l( )ther objects will appear hereinafter.

With these objects in view, the invention consists in the combinations and arrangements of parts hereinafter described andclaimed.

The invention will be best understood by reference to the accompanying drawing forming a part of this specification, and in` which, i Figure l is a central longitudinal section of a spark plug embodying the invention,

Fig. 2 is a bottom plan view thereof, Fig.

3 is a central longitudinal section through the lower portion of a spark plug of a slightly modified form, Fig. 4 is a central longitudinal section through the lower portion of a spark plug of still another form,

and Fig. 5 isa bottom plan view of the construction shownin Fig. 4.

The preferred form of construction, as illustrated in the drawing, embodied in a spark plug which in themain is'of conventional construction, comprising an outer tubular body l `which forms one pole of the plug and an inner slender rod? which forms the other pole of the lplug, the parts 1 and 2 being connected together and insulated from each other in the usual manner, the,

arrangement being such as to` result in' the formation of an annular inwardly opening space A between the inner end portions of said parts.

The novelty of the present invention is embodied in a fan or propellerqvwheel 3 which is mounted upon the reduced lower end of the member 2, the latter being formedv with an annular shoulder Il to prevent longitudinal movement of`the wheel 3 thereon in .one direction. Saidfan wheel is locked in positionby upsettingthc end 5 of the member 2, a washer 6 being inserted between said upset end and the fan wheel in order to alleviate friction. In order to insure against binding of the fan'wheel upon the member 2, said fan wheel is formed with an c-iongated hub 7, as c early shown.

i' The blades or vanes of the wheel 3 are of usual design, the same radiating from the hub 7 and being transversely bent or incliiyed so that upon a current of air conf tacting therewith the fan'wheel will be rotilted,

ln the use of the spark plug the blades of the fan wheel constitute the points of the inner pole member 2,' the spark being jumped from said points through the space siiiervening the same and the adjacent lower or inner edge of member l. The arrange ment is such that in the exhaust of the spent gases from the combustion chamber ofthe engine, said gases, in rushing past the spark plug toward the exhaust port, will impinge upon the blades of the fan wheel and thus cause rotation of the latter. Such rotation i of said fan wheel will serve to dislodge any carbon, soot or other foreign` matter which may have been. deposited thereon during the explosion, and hence, with this arrangement,

upon each discharge of spent gases from the engine, the p oints of the spark plug will be automatically cleaned. The rotation of said fan wheel also results in the creation of v eddies or currents around the lower end of the part 2 and in the space A which further 'insures against the deposit of any appreciable amount'of soot, carbon or foreign matterupon the lower end of member 1 or the .walls of space A. v

ln the torni shown in Fig. 3, an annular extension member 8 is provided-having pins 9 which engage with recesses 10 formed in theadjacent end of part 1` the arrangement being such to result in the formation of an annular space 11 ,at the inner end of member l. ln this arrangement, during ,rotationv of the fan wheel, as just described, 'air currents will be created which will'cause a draft or outward movement of 1 air and gases through the space 1l. The outward rushing or movement of air or gases through said space will also have the effect ofcreating a suction in the upper portion of space A and thus serve, 'it is thought, to more effectually agitate the air vand gases in this space and with the necessary result ofinsuring dislodging and removal of foreign mattei' therefrom.

In the form shown in Figs. 4 and 5, an

*oscillatory bar l2 is employed pivotally mounted for oscillation about a transverse of, as shown i n dotted lines in F ig. e. l

`arrangement 1s such that the member 152 axis at the inner end of pole member 2. The pivotal pin 13 which connects the bar l2 with the pole member 2 passes through lears 14 provided at opposite sides (rfisaid bar., the corresponding sides' of said pole member being flattened in order to afford engagement for said ears, aswill be readily understood. Said bar i2 ispermitted free oscillatory movement within a fixed range, the movement thus afforded being determined by the corners 15 at the lower end of pole piece 2 which are adapted for engagement against the upper side o the bar 12 in order to limit pivotal movemen there d'Ibo will be prevented from contacting with the member'l of the spark plug, a 'gap being. always formed between the ends of said baie' and the lower or inner edge of the member l for the jumping of the spark.

` With the latter construction, it will be seen that during explosion in the engine cylinder or upon the rushing of gases from the cylinder during scavenging of the latter, the disturbance of the air and gases within the cylinder will have the effect of vibrating the member l2 so as to shake any soot, carbon or other foreign matter there v claim as new and desire to secure by Letters Patent is:

y l. A spark plug for explosive engines comprising an outer tubular bdy forming one pole of the plug; an inner concentric longitudinally extending member arranged in said body and forming the other pole of the plug, there being an annular space formed between the inner end portions of said body and member; and a fan wheel mounted for free rotary movement on the inner end of said member and adapted, when rotated, to force a current of air or gases into said space, there being a laterally opening 4continuously open passage provided J.

in said body leading from said space and adapted to communicate with the combustion chamber in conjunction with which the plug is used, substantially as described.

2. A spark plug for explosive engines comprising an outer tubular body forming me pole of the plu an inner concentric longitudinally extending member arranged in said bodyfa'nd formin the other pole nf the plug, there being an annular space formed between the inner end portions of said body and member; and a fan wheel mounted for free rotary movement on the inner endiof said member and adapted,

when rotated, to force a current of air or i gases into said space, there being an annular laterally opening continuously openpassage provided in the inner portion of said body leading from said space adapted to communicate with the combustion chamber in conjunction with which the plug is used, substantially as described.

In testimony wheieof I have signed my name to this specification in the presence of two subscribing witnesses.

. JOHN W. BAXRD.

Witnesses:

JOSHUA R. H. Eo'rrs, HELEN F. Lnius. 

